Malicious PDF — malware analysis report

Static analysis result for SHA-256 28e0b59cca86a1cf…

MALICIOUS

PDF

89.7 KB Created: 2021-08-06 19:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 6c24e0659341bbed347e622adb06dcd5 SHA-1: eb7fabb04604e9f92933c81a409836fb28a3fea7 SHA-256: 28e0b59cca86a1cf542e03f5e2adaed7800bebc5086d44f482e5caeec841c89e
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution lure. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier clean score 0.1831

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160927e9d3f241---95349923662.pdf In PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c317a3e93ee---88330569237.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210713_224323.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/42709953545.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c141276eb8f---50034893770.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/fovuwuxezaxej.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/levolakikesetuxinewegode.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/33894254874.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/3c10183c27a26e8c95a69a1f1e0de299/15184182725.pdfIn PDF document text
    • https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/rigefilakajizubefeja.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16078b3eae8ae7---92913084013.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/meturalivojitigebereror.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/0esarp43fhld7j353j1dsvo4e6/98342381731.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9415937a6---51604289434.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a57be0c8009---nusigofiwotosiroxixawed.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728cea12f48---34931897725.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160bcdab1f2c17---tivarabixazorakoveli.pdfIn PDF document text
    • http://zimmerei-possert.at/lowezob.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0840c84b70---fetijipalu.pdfIn PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/7780621371.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/eac6ace62a18c0971c7017acffcd27f7/15172778669.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/mipadezixudegimazekupisi.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/fajas.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160ccffc79d791---votijorixitapuwefusig.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/b9d04212be54f4dbf5d3de9f96b00967/faguriliganojimasa.pdfIn PDF document text
    • https://seikai.jp/free_images/files/tevosekivorigires.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=what+is+load+and+trim+sheetPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010dba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBA 17216 bytes
SHA-256: 25f95802a24e39e25c896a643192c517e0e8e5c546566785a63b96cc6d905c97
font_01_sfnt_off00013ac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000152da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152DA 10504 bytes
SHA-256: d0f11d62a6ace8121bddf1de286b6aac36a16858f48546bec0e6300042dfd001

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